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Commitments and Contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
May. 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | May. 31, 2015
Line of Credit [Member] | JP Morgan Chase Bank, N.A. [Member] |  |  |  |  |
Lines of credit |  |  |  |  |
Amount available | $ 350.0 |  |  |  | $ 350.0
Expiration date |  |  |  |  | Feb. 28, 2016
Line of Credit [Member] | Bank of America, N.A. [Member] |  |  |  |  |
Lines of credit |  |  |  |  |
Amount available | 250.0 |  |  |  | $ 250.0
Expiration date |  |  |  |  | Feb. 28, 2016
Line of Credit [Member] | PNC Bank, National Association [Member] |  |  |  |  |
Lines of credit |  |  |  |  |
Amount available | 150.0 |  |  |  | $ 150.0
Expiration date |  |  |  |  | Feb. 28, 2016
Line of Credit [Member] | Wells Fargo Bank, National Association [Member] |  |  |  |  |
Lines of credit |  |  |  |  |
Amount available | 150.0 |  |  |  | $ 150.0
Expiration date |  |  |  |  | Feb. 28, 2016
Revolving Credit Facility [Member] |  |  |  |  |
Lines of credit |  |  |  |  |
Expiration date |  |  |  |  | Jun. 21, 2018
Maximum Amount Outstanding During Period | $ 0.0 | $ 0.0 | $ 150.0 | $ 100.0 |
Interest Rate on amount borrowed | 0.00% | 0.00% | 3.25% | 3.25% |

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